Tool retainer



TOOL RETAINER Filed March 1:2l 1928 2 Sheets-Sheet l INVENTOR mami-tlv 2 July3 1'9 8' G. w. SMITH TOOL RETAINER Filed march 12, 1928 2 sheets-sneer 2 l INVENTOR ATTORNEY.

Patented July 3, 1928.

UNITED STATES PATENT OFFICE. i

GEORGE W. SMITH, OF OTTUMWA, IOWA, ASSIGNOR T HARDSOCG WONDER DRILL C0.,

` INCORPORATED, 0F GTTUMWA, IOWA.

, Toor. nnfmrnna.

applique nieu naar, `1 2, 192s. serial No. 231,042.

My invention relatesto the art of drilling engines and `especially it has for an. ob'ect to provide means for` holding the rill against coming out ofl the socket, particularly in pulling the drill from the hole.

Further it is an object of the invention to provide a drill retainer that can be readily moved into and out of place with respect to the drilling engine; to provide aretainer having a yoke forthe drill, which yoke is placed or displaced by pivotal movement on an axis longitudinally parallel to the drills axis; to provide an improved drill retainer of the longitudinally yieldable type which will obviate any tendency to breakage due to blows of the tool.` y

Further it is an object of the invention to provide a retainer having a laterally swingable drill receiving yoke, means being provided to latch or hold the yoke in its position of engagement with the drill agamst accidental displacement.

Further objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends, th-e invention resides in the novel features of construction, combination and arrangement of parts, all of which will be first fully described in the followin description, then be particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which:

Figure l is a side elevation of the front head of a drilling engine andV a portion of the drill with the invention applied, the parts being shown in the drill retaining position.

Figure 2 is a view similar to Figure 1, the parts being shown in the released position.

Figure 3 is a side elevation 90 from` ing engine is provided with a drill retainer pivot ear 3v and with` a slotted ear 4, through the slot 5 of which one of 4the arms 10` of the retainer yoke passes.

lheslottedV ear 4 has a hump 6 and opposing convexity 7 cooperating with the slot 5 for the purpose ot' holding the yoke in the drill retaining positionl as will be hereinafter more fully explained.

The drillretaining yoke 8 has a recess or slot 9 to straddle the drill 15. The yoke includes the arms 10 one of which, as before stated, passes through the pivot ear 2 and the other passes through the slotted ear 4. The arms 10 have shoulders 11 and are provided with washers 12 at each side of the respective. ears 2 and 4 'and these arms carry springs 14 and nuts 13 by means of which a continuous tension is applied to the yoke tending to hold the collars 11. and the washers 12 in frictional contact with the respective ears 2 and 4.

When the parts are in the position shown in Figures 1 and 4 the yoke will be held in relation to the drill in such manner that the drill 15 will not leave the head 1. Any tendency for the head and drill to separate will be arrested by engagement of the drill collar 16 with the yoke 8. When, however, the parts are moved to the position shown in Figures 2 and 5 the yoke 8 will be moved out Y of the drill retaining position and leave the drill free to be removed from the head 1.

When the drill is in the retaining position (see Figures 1 and 4) it will be prevented from jarring out of that position by reason of the hump 6. When it is to be moved to the nonoperative position it will spring over the hump 6 and pass into the left hand portion of the slot 5 (see Figure 5). It should be understood that there is enough play in the ear 2 to permit the rod 10 that works in the slot 5 to pass over the hump 6 in passing to and from the retaining position. From the foregoing description, taken in connection with the accompanying drawings, it is thought that the complete construction, operation and advantages of my invention will be clear to those skilledin the art.

What I claim is: 1. In drill retainers, a drill head having a drill receiving portion, a pivot ear and a slotted ear on said drill head; a yoke having arms passing through said ears with stops to limit movement or' the arms and yoke in one longitudinal direction; springs and nuts on -said arms to hold said stops against said ears.

retaining position against accidental displacement troni that position.

3. In drilling engines having a drill head With a drill receiving portion; a tool retainer comprising a. pivot ear and a slotted ear carried by the drill head; a yoke having parallel arms passed through said ears respectively, said arnis having shoulders, Washers on said arms at each side of said ears; coil springs on said arins and spring retaining nuts on said arms functioning continuously to tend to retain said yoke yieldably on said ears, one of said arms being pi votally mounted in said pivot ear and the other said arin having movement bodily laterally along the slot oi said slotted ear, said slotted ear having a hump or lug adjacent one end to cooperate with said springs and retain said yoke in the tool engaging position only.

GEORGE W. SMITH. 

